An evaluation of exercise cardiac output using the CO2 rebreathing extrapolation technique
We investigated the reproducibility of the carbon dioxide (CO2) rebreathing extrapolation technique of Defares to determine the mixed venous partial pressure of CO2 (PvCO2) using a direct, rather than the commonly used indirect, extrapolation method. The PvCO2 determinations were made five times a d...
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| Veröffentlicht in: | European journal of applied physiology and occupational physiology 1997, Vol.75 (5), p.431-434 |
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| container_title | European journal of applied physiology and occupational physiology |
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| creator | ROGERS, G. G VAN DER WALT, W |
| description | We investigated the reproducibility of the carbon dioxide (CO2) rebreathing extrapolation technique of Defares to determine the mixed venous partial pressure of CO2 (PvCO2) using a direct, rather than the commonly used indirect, extrapolation method. The PvCO2 determinations were made five times a day on four subjects who exercised for 4 h daily on a bicycle ergometer over a period of 13 days. The concentration of CO2 in the rebreathing bag was monitored continuously using a rapid-response infrared capnograph. The mean standard deviation was 1.56 mmHg (0.21 kPa) for a mean PvCO2 of 47.6 mmHg (6.3 kPa), giving a mean coefficient of variation of 3.3%. This level of reproducibility agrees favourably with the reliability of direct measurements of pulmonary arterial partial pressure of CO2. We conclude that the CO2 rebreathing extrapolation technique can give reproducible PvCO2 values when a direct method of extrapolation is used. |
| doi_str_mv | 10.1007/s004210050184 |
| format | Article |
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We conclude that the CO2 rebreathing extrapolation technique can give reproducible PvCO2 values when a direct method of extrapolation is used.</description><identifier>ISSN: 0301-5548</identifier><identifier>EISSN: 1432-1025</identifier><identifier>DOI: 10.1007/s004210050184</identifier><identifier>PMID: 9189731</identifier><identifier>CODEN: EJAPCK</identifier><language>eng</language><publisher>Berlin: Springer</publisher><subject>Adult ; Air breathing ; Biological and medical sciences ; Blood Gas Analysis - methods ; Carbon Dioxide - physiology ; Cardiac Output ; Exercise - physiology ; Fundamental and applied biological sciences. 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G</creatorcontrib><creatorcontrib>VAN DER WALT, W</creatorcontrib><title>An evaluation of exercise cardiac output using the CO2 rebreathing extrapolation technique</title><title>European journal of applied physiology and occupational physiology</title><addtitle>Eur J Appl Physiol Occup Physiol</addtitle><description>We investigated the reproducibility of the carbon dioxide (CO2) rebreathing extrapolation technique of Defares to determine the mixed venous partial pressure of CO2 (PvCO2) using a direct, rather than the commonly used indirect, extrapolation method. The PvCO2 determinations were made five times a day on four subjects who exercised for 4 h daily on a bicycle ergometer over a period of 13 days. The concentration of CO2 in the rebreathing bag was monitored continuously using a rapid-response infrared capnograph. The mean standard deviation was 1.56 mmHg (0.21 kPa) for a mean PvCO2 of 47.6 mmHg (6.3 kPa), giving a mean coefficient of variation of 3.3%. This level of reproducibility agrees favourably with the reliability of direct measurements of pulmonary arterial partial pressure of CO2. We conclude that the CO2 rebreathing extrapolation technique can give reproducible PvCO2 values when a direct method of extrapolation is used.</description><subject>Adult</subject><subject>Air breathing</subject><subject>Biological and medical sciences</subject><subject>Blood Gas Analysis - methods</subject><subject>Carbon Dioxide - physiology</subject><subject>Cardiac Output</subject><subject>Exercise - physiology</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Humans</subject><subject>Male</subject><subject>Mathematical Computing</subject><subject>Oxygen Consumption</subject><subject>Partial Pressure</subject><subject>Reproducibility of Results</subject><subject>Respiration</subject><subject>Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics</subject><subject>Space life sciences</subject><subject>Vertebrates: respiratory system</subject><issn>0301-5548</issn><issn>1432-1025</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNo9kL1PwzAQxS0EKqUwMiJ5QGyBOztxnBFVfEmVusDCEtnOhQalSbAdVP57glox3ene07unH2OXCLcIkN8FgFRMWwao0yM2x1SKBEFkx2wOEjDJslSfsrMQPgEEFDKfsVmBusglztn7fcfp27SjiU3f8b7mtCPvmkDcGV81xvF-jMMY-Ria7oPHDfHlWnBP1pOJm78b7aI3Q9_uIyK5Tdd8jXTOTmrTBro4zAV7e3x4XT4nq_XTy_J-lQxCZjFR2maoFaEWTgiSGjRKhYhG5Hbqa2vjAG0la5tKa9JM2jTPVSUKWVhQlVywm33u4PvpbYjltgmO2tZ01I-hzAtQKKbQBbs6GEe7paocfLM1_qc8wJj064NugjNt7U03gfi3CaUmwiB_AZ2ubQE</recordid><startdate>1997</startdate><enddate>1997</enddate><creator>ROGERS, G. 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Psychology</topic><topic>Humans</topic><topic>Male</topic><topic>Mathematical Computing</topic><topic>Oxygen Consumption</topic><topic>Partial Pressure</topic><topic>Reproducibility of Results</topic><topic>Respiration</topic><topic>Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics</topic><topic>Space life sciences</topic><topic>Vertebrates: respiratory system</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ROGERS, G. 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The concentration of CO2 in the rebreathing bag was monitored continuously using a rapid-response infrared capnograph. The mean standard deviation was 1.56 mmHg (0.21 kPa) for a mean PvCO2 of 47.6 mmHg (6.3 kPa), giving a mean coefficient of variation of 3.3%. This level of reproducibility agrees favourably with the reliability of direct measurements of pulmonary arterial partial pressure of CO2. We conclude that the CO2 rebreathing extrapolation technique can give reproducible PvCO2 values when a direct method of extrapolation is used.</abstract><cop>Berlin</cop><pub>Springer</pub><pmid>9189731</pmid><doi>10.1007/s004210050184</doi><tpages>4</tpages></addata></record> |
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| ispartof | European journal of applied physiology and occupational physiology, 1997, Vol.75 (5), p.431-434 |
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| source | MEDLINE; Springer Nature - Complete Springer Journals |
| subjects | Adult Air breathing Biological and medical sciences Blood Gas Analysis - methods Carbon Dioxide - physiology Cardiac Output Exercise - physiology Fundamental and applied biological sciences. Psychology Humans Male Mathematical Computing Oxygen Consumption Partial Pressure Reproducibility of Results Respiration Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics Space life sciences Vertebrates: respiratory system |
| title | An evaluation of exercise cardiac output using the CO2 rebreathing extrapolation technique |
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